Mmh Presentation

8/14/2019 Mmh Presentation

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Meteringis an essential part ofthe settlement system.

Quantities metered

Active Power, P

Reactive Power, QFrequency, fVoltage, V

Power factor, cos


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Section 28 (3) of the ElectricityAct 2003

The Regional Load Despatch Centre shall

a) be responsible for optimumscheduling and despatch of

electricity within the region inaccordance with the contractsentered into with the licensees orthe generating companies

operating in the region.

b) ..

c) keep accounts of quantity of electricity transmitted through


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Section 32 (2) of the ElectricityAct 2003

The State Load Despatch Centre shall

a) be responsible for optimumscheduling and despatch of

electricity within a State inaccordance with the contractsentered into with the licensees orthe generating companies

operating in that State.b) ..

c) keep accounts of quantity of electricity transmitted through

the State grid.


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RLDCs and SLDCs will have a keyrole in the metering and settlementsystem

RLDCs at the regional level SLDCs at the State level

Objective of the settlement system is todetermine

Who bills whom for how much quantum ofpower and how much money?

Settlement System-Approach


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1) Power trading has to be notional:

buyer to pay the agreed amountto the supplier for scheduled

quantum of power.

2) Payment for variations fromthe schedule through a

common mechanism, e.g. U.I.

TO AVOID DISPUTES


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TRADER

UI POOL A/C

UI for

2 MW

A B

Rs. 2.00/ u

for 10 MW

Rs. 2.20/ ufor 10 MW

PAYMENTS

UI for

2 MW


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SCHEDULING,

METERING,

UISETTLEMENT

AGREEMENT& PAYMENTFORSCHEDULED

QUANTUM

WRLDC

SRLDC

APTRANSCO/APLDC

TATAPOWER

DISCOM-A

MSEB /MSLDC


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Active energy accounting for Embeddedcustomers:

1) SLDC to forward its own drawal schedule

and the drawal/injection schedule of theembedded customers separately to RLDCon day ahead basis.

2) Composite UI bill to the State(SEB/TRANSCO) as is being done now.

Further apportioning/recovery of UIcharges from the various Discoms and

embedded customers in the State -

ENERGY ACCOUNTING


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EVALUATION OF STATE DRAWAL

USING SPECIAL ENERGY METERS

STATE ADRAWAL =

Note :

HV SIDE OF 400/220 kV ICTs exclusivelyfeeding state a

+

Inter state lines operating in integrated modemetered at state A end

+

Lines from ISGS/CTU/BBMB (220 kV & above)stations to state a metered at state a end

+

HV side of 220/132 kV, 220/66 kV and 220/33 kVICTs in case of BBMB & PDD, J&K substationsexclusively feeding state A

+ Radial inter state infeeds to state A metered at

sending end

BBMB network treated similar as CTU network

i.e.ISTS


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Standby metering points havebeen selected taking into account

Accuracy and reliability ofmetering system

Minimisation of data collection

efforts arising out of an increasein number of locations


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0.2 S accuracy class for activepower as per IEC-687, 1992

Static, totally tamper proof

Two standard models-1A and 5A

Non-volatile memory for ten days

Special Energy Meters(SEMs) specifications


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Harmonics filtered out andonly

the fundamental energyrecorded.

Recording in secondaryquantities. CT/CVT ratios tobe applied at control centre.

Net energy (Wh) exchange in


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Cumulative Wh transmittal ateach mid-night.

Average frequency in each 15-minute time block stores as a

two- digit code.

Cumulative reactive energyregister for voltage below 97%



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Cumulative reactive energyregister for voltage above103%

High accuracy of internal clock(one minute per month or

better) with restrictedadvance/retard facility.

VT supply disturbance time*


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No separate auxiliary supply- onlyoptical coupler for data collection.

Calibration once in five years at atest lab (0.05 accuracy class testequipment or better)

On-site accuracy check once ayear using portable 0.2S testequipment



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